研究目的
Investigating the extraction of front-side ribbon resistance in crystalline silicon photovoltaic modules using electroluminescence imaging.
研究成果
The proposed EL-based method provides a fast and non-destructive approach to extract the front-side ribbon resistance of individual solar cells within a c-Si PV module. The method's accuracy was validated through manual measurements and simulation results, showing close agreement. This approach simplifies the cell-to-module resistive loss analysis, offering significant potential for application in the PV industry.
研究不足
The method is limited to estimating the front-side ribbon resistance and does not account for the rear-side ribbon resistance or soldering quality. It assumes uniform current flow through each ribbon and does not account for defects or degradation in solar cells.
1：Experimental Design and Method Selection:
The study employs electroluminescence (EL) imaging to extract the front-side resistive loss for individual cells within a crystalline silicon photovoltaic module. The method leverages the exponential relationship between local luminescence intensity and local voltage to estimate voltage distribution along individual ribbons.
2：Sample Selection and Data Sources:
The experiment involves a half-cell module consisting of 8 halved mono-Si solar cells and commercial PV modules with 60 full-size mono-Si or multi-Si solar cells.
3：List of Experimental Equipment and Materials:
A silicon CCD camera (8 MegaPixel coolSamba HR830) was used to capture high-quality EL images. The modules were forward biased under two different conditions for EL imaging.
4：Experimental Procedures and Operational Workflow:
EL images were taken under low current injection (~10–15% of 1-Sun ISC) and high current injection (near ISC). The voltage distribution was extracted from these images to compute the front-side ribbon resistance.
5：Data Analysis Methods:
The voltage difference along the ribbon length was measured and used to compute the front-side ribbon resistance, considering the distributive nature of current flow along the ribbon.
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